tests(mm): exclude UnknownModelConfig from model config tests

Author: psychedelicious

tests/test_model_probe.py

@@ -17,6 +17,7 @@
     MainDiffusersConfig,
     ModelConfigBase,
     ModelConfigFactory,
+    UnknownModelConfig,
     get_model_discriminator_value,
 )
 from invokeai.backend.model_manager.legacy_probe import (
@@ -257,6 +258,10 @@ def test_any_model_config_includes_all_config_classes():
         extracted.add(config_class)
 
     expected = set(ModelConfigBase.all_config_classes()) - {MinimalConfigExample}
+
+    # UnknownModelConfig is deliberately excluded from AnyModelConfig to avoid it being used for model probing.
+    expected.remove(UnknownModelConfig)
+
     assert extracted == expected